last year was also a zinefest in other town in germany but i dont went there because was sooo far from home anyway here in frankfuert i dont know much about zine scene because im pretty new in this town.

Pink Poseidon parties, taking place during the holiday seasons, also in Paris. You can buy zines during the first half of the party, because afterwards it becames totally crazy with noise / improv music, performances, etc. Very very dark. http://www.pinkposeidon.com/

Fais-Le-Toi-Même, probably the best zine festival in France, with concerts, home-made film projections, etc, takes place in autumn in Lille (North of France, near Belgium).http://www.fais-le-toi-meme.com/

La Fanzinothèque, the biggest zine library in Europe (I'm serious) organizes activities around the year, but they don't communicate very well about them. Take a look at their page... http://fanzino.org/

But most zines can also be seen during the Salón del Cómic, which takes place in may in Barcelona
http://comic-28.ficomic.com/default.cfm

Illustation, a new Barcelona festival about alternative zines and arts, with several events around the year. It's organized by French folk, has a very nice French feeling to it. http://ilustation.blogspot.com/

In the UK theres:
London Zine symposium (usually may)
Alternative Press Fair in London (usually in the winter)
Brighton Zinefest (usually may)
Edinburgh Zine Festival
Women's Library Zinefest in London
Birmingham Zinefest
There are also often things in Manchester, Leeds and Newcastle